Dragged in images dont overlap properly #58550

New Issue

green giant · 2018-12-02T21:34:18+01:00

green giant commented

2018-12-02 21:34:18 +01:00

System Information
Operating system: Windows 10
Graphics card: Gtz 970

Blender Version
Broken: 2.80 beta Date: 2018-11-30 22:29

Short description of error
When dragging in images the planes don't overlap properly. One is drawn fully over the other even if its partially behind it. I would expect it partially occluded based on depth like normal geometry

Exact steps for others to reproduce the error
Drag in two images. Rotate one 90 degrees to the other. Rotate view around and observe that one images are not drawn properly

**System Information** Operating system: Windows 10 Graphics card: Gtz 970 **Blender Version** Broken: 2.80 beta Date: 2018-11-30 22:29 **Short description of error** When dragging in images the planes don't overlap properly. One is drawn fully over the other even if its partially behind it. I would expect it partially occluded based on depth like normal geometry **Exact steps for others to reproduce the error** Drag in two images. Rotate one 90 degrees to the other. Rotate view around and observe that one images are not drawn properly ![Screenshot 2018-12-02 14.30.40.png](https://archive.blender.org/developer/F5793046/Screenshot_2018-12-02_14.30.40.png)

green giant commented

2018-12-02 21:34:18 +01:00

Added subscriber: @greengiant83

blender-admin commented

2018-12-02 21:34:18 +01:00

#61620 was marked as duplicate of this issue

Jacques Lucke commented

2018-12-03 12:11:55 +01:00

Added subscriber: @JacquesLucke

Clément Foucault was assigned by Jacques Lucke

2018-12-03 12:11:55 +01:00

Jacques Lucke commented

2018-12-03 12:11:55 +01:00

This is a limitation currently. https://developer.blender.org/T57696#551945

Not sure if that will be fixed eventually.

This is a limitation currently. https://developer.blender.org/T57696#551945 Not sure if that will be fixed eventually.

Clément Foucault commented

2018-12-03 20:19:24 +01:00

We could at least support it for alpha = 1.0 images. The problem is that we need to detect if the image make use of its alpha channel.

Clément Foucault commented

2019-03-16 03:48:49 +01:00

Added subscribers: @AdrianFerguson, @fclem, @salilsay, @IonUppercut

Clément Foucault commented

2019-03-18 21:44:21 +01:00

Added subscriber: @brecht

Clément Foucault commented

2019-03-18 21:44:21 +01:00

@brecht is there a way to detect that an image has a non opaque alpha channel? Or should we add a "use transparency" toggle option ?

Brecht Van Lommel commented

2019-03-19 00:36:02 +01:00

If either Use Alpha on the image is off or ibuf->planes != 32, then we know the image file does not have alpha. Use Alpha` could be exposed in the image empty UI for manual control.

It's not uncommon to have images saved with an alpha channel that is fully opaque, so it won't handle all cases. It's possible to look at the alpha values to see if they are all opaque, either every time the GPU texture is created if we think it's worth the cost. Alternatively we could try do some detection the first time the image is loaded and change some settings based on that, though it's potentially confusing if the image file is modified later to have alpha.

If either `Use Alpha` on the image is off or `ibuf->planes != 32`, then we know the image file does not have alpha. Use Alpha` could be exposed in the image empty UI for manual control. It's not uncommon to have images saved with an alpha channel that is fully opaque, so it won't handle all cases. It's possible to look at the alpha values to see if they are all opaque, either every time the GPU texture is created if we think it's worth the cost. Alternatively we could try do some detection the first time the image is loaded and change some settings based on that, though it's potentially confusing if the image file is modified later to have alpha.

blender-admin commented

2019-03-20 16:33:17 +01:00

This issue was referenced by c5fc861172

This issue was referenced by c5fc861172879102034129ecbe653e91eeff5caf

Clément Foucault commented

2019-03-20 16:34:06 +01:00

Changed status from 'Open' to: 'Resolved'

Clément Foucault closed this issue

2019-03-20 16:34:06 +01:00

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Dragged in images dont overlap properly #58550